Motor driven camera

ABSTRACT

In a camera having a stop drive mechanism adapted to be driven by an electric motor to vary a stop aperture and a film wind-up mechanism adapted to be driven by the electric motor to wind up a film, the electric motor is rotated to drive the stop drive mechanism before exposure of the film, and it is also rotated to drive the film wind-up mechanism after the exposure of the film. The rotating speeds of the electric motor in the first rotation to drive the stop drive mechanism and in the second rotation to drive the film wind-up mechanism are independently variable.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a motor driven camera in which aplurality of mechanisms in the camera are driven by a motor.

2. Description of the Prior Art

In a modern motor driven camera, there is a tendency to use a motordirect drive system not only to wind up a film but also to drive amirror, a stop and charge a shutter, because the direct drive system issuperior with respect to efficiency and simplification of construction,to an indirect drive system in which a spring is charged by an electricmotor and a charge of the spring is used to drive the mechanisms.

However, when it is desired with such a camera to change a time requiredto one frame photographing by changing a rotating speed of the motor,the following problem is encountered.

In a camera which directly drives a member for determining a stopaperture by the motor, a displacement speed of the member changes as themotor rotating speed changes. The aperture determining member is latchedby a latch mechanism when it reaches a position corresponding to adesired stop aperture in the course of displacement from a positioncorresponding to a maximum stop aperture to a position corresponding toa minimum stop aperture prior to shutter operation. As the displacementspeed of the aperture determining member increases, it becomes difficultto accurately stop the member at the desired position and hence an erroroccurs in the stop control.

In a single lens reflex type motor driven camera which directly drives amirror drive system by the motor, as the motor rotating speed increases,a mirror reciprocating speed also increases. As a result, a shock causedwhen the mirror is raised and stopped at a photographing positionincreases. This causes a vibration of the camera and results in a lowquality picture.

In a camera which directly drives mechanisms which are driven during thetime period between the depression of a release button and the start ofrun of the shutter (stop drive system, mirror drive system,auto-focusing lens drive system, etc.) by the motor, as the motorrotating speed changes, a start timing of the exposure of the film alsochanges. That is, the time period from the depression of the releasebutton to the start of the run of the shutter changes. As a result, auser cannot determine the exposure timing and hence a picture which isdifferent from an intended one is produced.

SUMMARY OF THE INVENTION

It is an object of the present invention to provide an improved camerawhich drives a plurality of mechanisms mounted in the camera by one ormore electric motors.

In one aspect of the present invention, there is provided a motor drivencamera having a speed changing device which allows change of operationtime of at least one of the plurality of mechanisms independently fromother mechanisms.

For example, by extending the operation time of the stop controlmechanism or the mirror drive mechanism independently from othermechanism by the speed changing device, the precision of the stopcontrol is improved or the shock to the camera is relieved withoutextending the operation times of other mechanisms.

In another aspect of the present invention, there is provided a motordriven camera having a mode selection device which selectively lowersthe drive speed of the wind-up mechanism after the exposure. Thus, lownoise photographing is attained.

It is another object of the present invention to provide an improvedmotor driven camera which drives a film wind-up mechanism in the cameradevice by an electric motor.

In one aspect of the present invention, the drive of the wind-upmechanism is controlled in association with a rear cover which opens afilm chamber to allow loading of a film in the camera. When the rearcover is in an open position, the wind-up mechanism is controlled suchthat a predetermined amount of wind-up necessary to positively couplethe film to a wind-up spool is assured, and when the rear cover is in aclosed position, the wind-up mechanism is controlled such that apredetermined amount of wind-up necessary to completely wind up aleading edge of the film is assured.

It is a further object of the present invention to provide an improvedmotor driven camera which enables multi-exposure photographing.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic perspective view of a drive mechanism in oneembodiment of a camera of the present invention,

FIG. 2 is a schematic perspective view of a sprocket mechanism of FIG.1,

FIG. 3 is a schematic perspective view of a mirror mechanism of FIG. 1,

FIG. 4 is a schematic perspective view illustrating a mirror raisedposition,

FIG. 5 is a schematic perspective view of a modification of amulti-exposure mechanism,

FIG. 6 is a chart of relations between the operation of the embodimentand switches for controlling the operation,

FIG. 7 is an outer view of the camera of the embodiment,

FIG. 8 is a partial plan view of FIG. 7,

FIG. 9 is an example of a battery pack used in the embodiment,

FIG. 10 is an example of a higher power battery pack,

FIG. 11 is a switch which is switched depending on the battery packs ofFIGS. 9 and 10,

FIG. 12 is a circuit diagram of the embodiment, and

FIG. 13 is a detailed circuit diagram of an exposure control unit ofFIG. 12.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

FIG. 1 shows one embodiment of the present invention and shows a cameramechanism.

Details of the respective elements are now explained in the sequence ofphotographing preparation operation.

First, in order to load a film 28, a latch which latches a camera rearcover is unlatched by known means. Thus, the rear cover is released anda portion 1 of the rear cover is moved left-downward as viewed in FIG.1.

A lever 3 is rotated leftward (counter-clockwise direction) to followthe portion 1 of the rear cover around a shaft 4 by a biasing force of aspring 2. As a result, a lever 5 fixed to a lower portion of the shaft 5is also rotated leftward and it pushes an end 6a of a holding lever 6.As a result, the lever 6 is rotated rightward (clockwise direction) anda rewind condition is released. Thus, the lever 6 and a rewind button 7which has been in a raised position are brought into a positionalrelation as shown. The rewind condition and the release thereof will beexplained later.

As the lever 5 is rotated leftward, an end 5a thereof is released fromthe abutment to switches SW12 and SW17 so that the switch SW12 is turnedoff and the switch SW10 is turned on. As a result, even in the openposition of the rear cover, a motor 600 can be rotated to drive a spool29 and a sprocket 49. This operation will be described later.

A pin 3a is mounted at the other end of the lever 3. As the lever 3 isrotated leftward, the pin 3a pushes one arm 9a of a wind-up limit lever9 which rotates around a shaft 8 to rotate the lever 9 leftward. Awind-up limit switch SW5 is arranged behind the arm 9a and it is turnedon as the lever 9 is rotated rightward. The switch SW5 is connected to amotor control circuit to be described later which causes the motor 600to rotate in the opposite direction to an arrow shown at a time when aswitch SW6 at the top of FIG. 1 is turned on when the switch SW5 is on.When the lever 9 is rotated rightward, a hook 9b at an end of anotherarm is retracted from a notch 12a of a wind-up limit plate 12 so thatthe wind-up limit plate 12 is rendered rotatable.

When the lever 3 is rotated leftward, a pawl 13 which latches a filmcounter 20 is rotated rightward around a shaft 15 through a pin 13cagainst a biasing force of a spring 16. As a result, an engagement 13ais disengaged from a ratchet wheel 17 fixed to a bottom end of a shaft18. Thus, the ratchet wheel 17, the shaft 18, a cam 19 fixed to theshaft 18 and the film counter 20 are rotated leftward in union by abiasing force of a spring 21. The rotation is terminated when a pin 22,mounted at a lower portion of the film counter 20, abuts against astopper 23 mounted on a base plate not shown. At this time, a letter "S"on the film counter 20 faces an index 24 to indicate a reset conditionof the film counter 20.

An end 25a of another feed pawl 25 which engages with the ratchet wheel17 is pushed by the end 13a of the pawl 13 and retracted from theengaging position. Thus far, the operation when the rear cover is openedhas been described. After the rear cover has been opened, the film isloaded. During this period, the motor 600 is not rotated.

The operation from the loading of the film to the preparation of thephotographing of a first frame, that is, the wind-up operation of aleading edge of the film by the film feed system is now explained. Anend of the film 28 is inserted into a groove 29a of the spool 29 and apush button 100 is depressed. Thus, a switch SW13 and the switch SW6 areturned on. Since the switch SW5 is already on at this time, the motor600 starts to rotate oppositely to the arrow shown as described above.As a result, gears 33, 59 and 60 are rotated oppositely to the arrowthrough a pinion 32 and a worm 58 fixed to a shaft 31 of the motor 600.As the pinion 32 rotates, a gear 37 is rotated oppositely to the arrowthrough reduction gears 33, 34, 35 and 36. The reduction gears serve toproduce a torque necessary to feed the film from the small size motor600.

A film feed disc 39 at the bottom of a shaft 39 to which the gear 37 isfixed has a pawl 39a which engages with a hook 40a of a pawl 40 androtates a gear 42 together with the pawl 40 in the same direction. Thus,the spool 29 is rotated in the direction of the arrow shown through aknown spool friction mechanism 43 and the film 28 is wound up on thespool 29.

On the other hand, the rotation of the gear 42 is transmitted to a gear45 through a gear 44, but the rotation of the gear 45 is not directlytransmitted to a sprocket shaft 47. This is explained with reference toFIG. 2. As described above, the rewind condition is released by therightward rotation of the lever 6, but at the end of rewinding of thefilm used in the previous photographing, the phase of a pin 47a mountedat the top of the sprocket shaft 47 usually does not coincide with thephase of a groove 45a formed in the gear 45. Thus, the shaft 47 and thesprocket 49 which is rotationally coupled to the shaft 47 by a pin 48 onthe shaft 47 and a groove 49a are independent from the gear 45. Thesprocket 49 is rotated when perforations of the film 28, which is movedas the film 28 is wound on the spool 29, mesh with teeth 49b of thesprocket 49, and hence the shaft 47 is also rotated.

As is known, when the mechanisms are driven by a single drive source,design is such that the spool 29 winds up more of the film 28 than thesprocket 49. Therefore, as the film 28 is moved, it is usual that thephase of the pin 47a and the phase of the groove 45a coincide at acertain time point and engage with each other so that the feed amount ofthe film 28 is determined by the rotation of the gear 45. This is alsotrue for the present embodiment.

A gear 50 coupled to a gear 51 is fixed to the shaft 47. The pawl 25 iscoupled to an eccentric position on the gear 51 so that it isreciprocated as the gear 51 rotates. As the sprocket 49 winds up thefilm 28 frame by frame, the ratchet wheel 17 is rotated one tooth at atime through the gear 51 and the pawl 25. As a result, as the film isfed, the film counter 20 is rotated such that a letter "1" faces theindex 24.

The cam 19 fixed to a shaft 18 prevents the counterclockwise rotation ofthe lever 9 and retracts the hook 9b from the outer periphery of thewind up limit plate 12 until the film counter 20 indicates "1".Immediately before the film counter 20 indicates "1", the film feed ismechanically stopped. At this time, the switch SW5 which has been pushedby the arm 9a of the lever 9 is turned off and the motor 600 isdeenergized by an action of a control circuit 185 to be described later.Thus, the wind-up of the leader of the film is terminated.

A holding lever 53 is biased rightward around a shaft 54 by a spring 55,and only when a pin 53b mounted on the holding lever 53 abuts against arecess 12c formed on an outer periphery of the limit plate 12, an end53a can engage with an end 9d of the lever 9 at a position displacedfrom the limit plate 12.

As described above, the lever 9 is disengaged from the limit plate 12when the rear cover is opened, and it is rotated by an action of a lever56 to be described later to be displaced from the limit plate 12.

During the wind-up of the film leader, a stop 79, a leading shuttercurtain 115 and a trailing shutter curtain 115' of the shutter and aquick-return mirror held on a support frame 132 are not driven. Thosewill be described later.

The photographing operation and the following wind-up operation are nowexplained.

When the push button 100 is again depressed, the first stage switch SW13is turned on. As a result, a portion of a circuit to be described lateris energized.

A light transmitted through a lens 78 is reflected by a quick-returnmirror held on the support frame 132 and directed to a photosensitiveelement 301. An output from the photosensitive element 301 is suppliedto an exposure control circuit where it is processed. When the pushbutton 100 is depressed further, the second stage switch SW6 is turnedon and the light measurement result by the photosensitive element 301 isstored in the exposure control circuit.

When the switch SW6 is turned on, the following further operations arealso started. Since the switch SW5 is off at this time, the motor 600starts to rotate in the direction of the arrow by the action of themotor control circuit. Accordingly, the pinion 32 and the worm 58 arerotated and the gears 33, 39 and 60 are rotated in the direction of thearrow.

By the rotation in the direction of the arrow, the film feed systemwhich is linked to the pinion 32 and the gear 33 is driven in thefollowing manner. The rotation of the motor shaft 31 is converted toappropriate rotating speed and torque by the reduction gears so that theelements 32-39 and 61 are rotated in the direction of the arrow. Whenthe limit plate 61 rotates rightward by a predetermined angle, alatching pawl 62 which contacts the outer periphery of the rotationlimit plate 61 latches an engagement 61a to prevent the rotation of thelimit plate 61. As a result, it serves as a stopper for the stop drivesystem, the mirror drive system and the shutter charge system to bedescribed later. The rotation of the disc 39 in the direction of thearrow is not transmitted to the pawl 40. Accordingly, the gear 42 andthe following elements are not rotated and the film is not fed.

The stop drive system which is linked to the worm 58 and the gear 59 isdriven in the following manner. As the motor 600 is rotated, the gear59, the shaft 69, the gear 70 and the cam 71 are rotated in union in thedirection of the arrow. The rotation continues until the pawl 62prevents the rotation of the rotation limit plate 61. At an early stageof the rotation of the cam 71, an end 71a thereof rotates an end 102a ofa lever 102 counterclockwise but the lever 102 does not rotate around ashaft 73 mounted on a holding lever 75 and an arm 102b of the lever 102abuts against a pin 74 mounted on the lever 75 and is rotated leftwardin union with the lever 75 around a shaft 77.

In the present embodiment, the lever 79 which is linked to the stopmechanism of the lens 78 is biased downward as seen in FIG. 1. Thedownward movement of the lever 79 is prevented by an end 80a of a limitlever 80 so that the stop is fully opened. When the pin 81 held by ahook 75a is released by the leftward rotation of the holding lever 75,the lever 80 is rotated rightward around a shaft 84 in a direction tocause the end 80a thereby to descend and to follow the cam 71 due to theforces of the lever 79 and a spring 82. Thus, the aperture is stoppeddown.

The amount of reduction of the stop aperture is measured by a resistor302 and a brush 303 mounted at an end 80c of the lever 80. When themeasurement result reaches an appropriate value determined by a presetshutter speed and a film sensitivity, a coil 85 is energized by anaction of the exposure control circuit to be described later. Thus, anarmature 88 which has been attached to a yoke 87 by a permanent magnet86 is rotated leftward around a shaft 91 together with a latch pawl 90against the biasing force of the spring 89. Since a pawl 90a of thelatch pawl 90 engages with speed-up gears including gears 93a, 93b and93c, the limit lever 80 which is in union with the gear 93c is stoppedand an aperture value for a proper exposure is set. The speed-up gears93a, 93b and 93c serve to improve a resolution in setting the stopaperture.

The shutter charge system which is linked to the worm 58 and the gear 60is driven in the following manner.

As the motor 600 is rotated, the gears 59 and 60, a shaft 105 and gears106, 107 and 107' are rotated in the direction of the arrow. As the gear107 is rotated, a leading shutter curtain charge gear 109 is rotated andmeshed with a sector gear. While the meshed condition continues for acertain period, the gear 110 is rotated leftward around a shaft 112, andwhen the gear 109 faces a non-toothed area of the gear 110, the gears109 and 110 are disengaged and thereafter only the gear 109 continues torotate rightward. The rightward rotation of the gear 109 is stopped whenthe rotation limit plate 61 of the film feed system engages with thepawl 62.

On the other hand, the secter gear 110 which was disengaged from thecharge gear 109 is returned to a position shown in FIG. 1 by a biasingforce of a spring 111. During the counterclockwise rotation of thesector gear which follows the gear 109, the pin 114 causes a leadingshutter curtain arm 113 to rotate around the shaft 112. A pin 117 ismounted on the sector gear 110 and it pushes a spring 118 as the gear110 is rotated leftward. A pawl 116 is rotated rightward by the biasingforce of the spring 118 to urge an armature 119 mounted on the pawl 116to a yoke 120. Thereafter, the yoke 120 and the armature 119 are held inthe attracted position by a force of attraction of a permanent magnet121 against a biasing force of a spring 122. A hook 116a of the pawl 116and a latch 113a of the arm 113 are kept in engagement against a leadingshutter curtain drive spring not shown. Thus, the preparation for theleading shutter curtain drive operation is completed. An auxiliary arm123 serves to support the leading shutter curtain 115 together with thearm 113.

As to the trailing shutter curtain, the gear 107' is rotated in thedirection of the arrow of FIG. 1 to complete the preparation for thetrailing shutter curtain drive operation.

The above operation is one example of a known shutter charge operation.The shutter charge operation is primarily effected while the stopaperture is stopped down. Thus, the shutter charge operation serves toreduce the speed in order to attain the stop control precisely.

In the course of stopping down the stop aperture, a gear 70 and a gear124 always mesh and a shaft 125 continues to rotate. The shaft 125drives a reflex mirror.

As the shaft 125 is rotated leftward, an arm 126 and a shaft 127 mountedat an end of the arm 126 are rotated, and an end 128a of an arm 128rotatably mounted on the shaft 127 is moved rightward. As the end 128ais moved rightward, a pawl 133a at an end of a leaf spring 133 fixed toan arm 130 engages with the arm 128 as shown in FIG. 3. Thus, the arm128 and the arm 130 are engaged and thereafter they act as one arm. Itserves as a rod, the arm 126 serves as a crank which rotates around theshaft 125 and the shaft 127 serves as a crank pin to push up a frame132. Since an enclosure 126a has an opening, the movement of a shaft 129is not impeded. The frame 132 starts to rotate leftward around a shaft64 and soon after the arm 132a which is in union with the frame 132 isdisengaged from a switch SW1 so that the switch SW1 is turned off duringthe leftward rotation of the shaft 125. As explained above, the shuttercharge operation is carried out during this period.

The switch SW1 is turned off after a switch SW4 has been turned off by aprojection 113'a of an arm 113' which is rotated counterclockwise by theshutter charge operation.

In the crank mechanism described above, a gear ratio of the gears 70 and124 is selected such that the arm 126 is substantially in line with thearms 128 and 130 when the shaft 125 is rotated leftward by one half ofrevolution. This is the time when the rotation limit plate 61 of thefilm feed system and the pawl 62 engage.

A condition when the mirror has been raised is shown in FIG. 4. Underthis condition, an arm 132a which is in union with the frame 132 turnson a mirror stop switch SW7 near the end of rising of the frame 132.Thus the motor 600 is stopped by the action of the control circuit. Themotor 600 is provided with a known slip mechanism not shown so that itslips when the rotation is stopped by an external force.

In this manner, the stop aperture is stopped down from the full openposition to a desired position, the shutter is charged and the reflexmirror is retracted from the optical path so that the exposure operationby the shutter is ready.

When a coil 135 is energized at an appropriate time, a force ofattraction of a permanent magnet 136 is temporarily reduced and theattraction of the armature 119 and the yoke 120 is released by a biasingforce of a spring 137 and the pawl 16 is rotated leftward and the hook116a releases the engagement with the latch 113a of the arm 113. Thus,the leading shutter curtain 115 is moved by a force of a leading shuttercurtain drive spring not shown. Then, a coil 135' is energized at a timewhen a preset shutter speed is obtained. Thus, a trailing shuttercurtain 115' is driven in the same manner as the leading shuttercurtain. Near the beginning or the end of the drive of the trailingshutter curtain, the switch SW4 which has been off in the chargecondition is turned on because it abuts against the projection 113'a ofthe arm 113'.

As a result, the motor 600 is rotated reversely immediately or with anappropriate time lag by the action of the control circuit to bedescribed later. Thus, the mirror is returned, the stop aperture isfully opened and the respective elements assume the positions shown inFIG. 1.

As the motor is rotated reversely, the arm 126 is rotated clockwise andthe arms 128 and 130 and the frame 132 descend from the positions shownin FIG. 4. When the arm 126 is oriented downward, the enclosure 126aabuts against the shaft 129 and they are on the same axis. Thus, thepositions of FIG. 3 is restored and the frame 132 is prevented frommoving.

Whatever times of revolution the shaft 125 makes under this condition,the arms 126 and 128 merely rotate around the shafts 125 and 129 throughthe pin 127, and the arm 130 is not displaced and the holding frame 132is not moved.

As the holding frame 132 descends, the switch SW7 is turned off and theswitch SW1 is turned on.

At an early stage of the return operation of the mirror, the pin 127abuts against an end 306a of a reset lever 306 to rotate the lever 306leftward around a shaft 307 against a biasing force of a spring 308.Thus, another arm 306b of the lever 306 is moved upward so that thearmature 88 is attracted to the yoke 87. As a result, the engagement ofthe latch 90a and the gear 93a is released and the gear is permitted torotate.

As the motor 600 rotates reversely, the stopping cam 171 is rotatedleftward. The cam 71 has a constant lift area. After the engagement ofthe latch 90a and the gear 93a has been released, the amount of lift isgradually increased. Thus, the pin is pushed upward and the lever 80 isrotated leftward to raise the lever 79. As a result, the stop apertureof the lens 78 is fully opened. As the lever 80 is rotated leftward, theaperture holding lever 75 is rotated rightward by the biasing force ofthe spring 76 and the hook 75a engages with the pin 81 so that the fullopen position of the stop aperture is maintained. As the cam 71 isrotated leftward the end 71a thereof raises the end 102a of the holdrelease lever 102, but the lever 102 is merely rotated rightward againsta spring 141 and the lever 75 is not rotated leftward. Accordingly,whatever times of leftward revolution the cam 71 makes, the stop is keptin the full open position.

In this manner, the motor 600 is rotated reversely after the exposure torotate the shaft 69 reversely so that the mirror is returned to thephotographing optical path and the stop is returned to the full openposition. The motor 600 can continue the reverse rotation while theabove conditions are kept.

The operation of the shutter charge system during this period is nowexplained. As the motor 600 is rotated reversely after the exposure, thegear 60 starts to be rotated reversely. Thus, the charge gear 109 isrotated leftward and engages with the sector gear 110 to rotate the gear110 rightward against the force of the spring 111. However, since a pin114 mounted on the gear 110 goes away from the arm 113, the arm 113 isnot moved. Similarly, the arm 113' is not also moved.

Thereafter, the charge gear 109 is disengaged from the sector gear 110and the sector gear 110 is rotated leftward by the biasing force of thespring 111 so that it returns to the position shown. Similarly, thesector gear 110 is rotated leftward by the force of the spring 111'after the rightward rotation and returns to the position shown. Thus, inthe shutter charge system, whatever times of revolution the motor 600makes after the exposure, the conditions are not affected.

The operation of the film feed system is next explained. As the motor600 and the pinion 32 are rotated reversely after the exposure, the gear37 is rotated leftward through the reduction gears. A pin 37a mounted onthe gear 37 is moved accordingly to push an arm 65a of a lever 65 sothat the lever 65 is rotated rightward.

As a result, a pin 68 mounted at the other end of the lever 65 pushes anarm 56a of the lever 56 so that the lever 9 is rotated rightward by thelever 56 and the engagement of the hook 9b at the end of the lever 9 andthe limit plate 12 is released and the limit plate 12 is permitted torotate. Thus, the wind-up limitation is released by the rotation of themotor 600. At the same time, the end 9d of the lever 9 engages with theend 53a of the holding lever 53 so that the release condition ismaintained.

As the gear 37 is rotated reversely, the rotation limit plate 61 startsto be rotated from the engagement position with the pawl 62 and the filmfeed disc 39 is also rotated reversely. When the projection 39a of thedisc 39 engages with the hook 40a of the pawl 40 as shown in FIG. 1, thegear 42 starts to be rotated leftward. As the gear 42 is rotated, thespool 29 is rotated in the direction of the arrow through the frictionmechanism 43. The rotation of the gear 42 is transmitted to the gears 44and 45 and the sprocket shaft 47 is rotated leftward through theengagement of the groove 45a and the pin 46. Accordingly, the film 28 isfed.

Soon after the film feed has been started, the maximum diameter portion12b of the limit plate 12 instead of the projected portion 12c abutsagainst the pin 53b. The lever 53 is rotated leftward around the shaft54 to release the engagement with the end 9d of the lever 9. The lever 9is rotated leftward by the force of the spring 52 and the hook 9bthereof abuts against the maximum diameter portion 12b of the limitplate 12. The end 9d limits the more than predetermined amount ofrightward rotation of the lever 53 to prevent the pin 53b from fittinginto the notch 12a.

As the limit plate 12 is rotated to bring the notch 12a to the positionto face the hook 9b of the lever 9, they engage to prevent the rotationof the limit plate 12 so that further wind-up is inhibited. Thus, theone-frame wind-up of the film is completed. At the same time, the switchSW5 is turned off and the reverse of the motor 600 is stopped by themotor control circuit.

During this period, the gears 50 and 51 are continuously rotated by thesprocket shaft 47 so that the film counter 20 is advanced by one scale.During the film feed, the stop drive system, the shutter charge systemand the mirror drive system are idling.

When the push button 100 is again depressed to photograph, the abovesequence is repeated.

When the photographing of one roll of film is completed, the rewindbutton 7 is pushed upward to raise the sprocket shaft 47 which isnormally biased downward. An end 6b of the holding lever 6 is insertedunder a step 7a of the button 7 by a biasing force of a spring 139 tokeep the shaft 47 at the raised position.

As the lever 6 is rotated leftward, a switch SW15 is turned off. Thefunction of the switch SW15 will be described later.

As the shaft 47 is raised, the pin 47a escapes upward from the groove45a of the gear 45 so that the sprocket 49 and the shaft 47 can rotateindependently from the gear 45 and the gears 44 and 42 coupled thereto.

On the other hand, as the shaft 47 rises, the gear 50 is also raised anda lever 150 fixed to a shaft 152 by a conical portion 50a of the gear 50rotates the shaft 152 and a lever 153.

When a cam 157 is rotated clockwise by approximately 90 degrees by arewind lever 155, a shaft 158 is raised. The shaft 158 is rotationallycoupled to a pulley 159 and has a rewind fork 161 at a top end. As theshaft 158 is raised, the fork 161 engages with a spool of a filmmagazine. As the cam 157 is rotated, a switch SW14 is pushed and turnedon. As a result, the motor 600 starts to be rotated reversely by thecontrol circuit and the film feed plate 39 is rotated leftward with thegear 42. The engagement of the feed plate 39 and the film feed pawl 40is released as the button 7 is pushed up. When the entire film has beentaken out of the magazine, the rewind button 7 is pushed up. An end 153aof the lever 153 is moved leftward. In most of normal conditions, thephase of the film wind-up operation is stopped at a position before oneframe of film has been fully wound. Therefore, a projection 40b of thefilm feed pawl 40 is not always in a position to face the end 153a ofthe lever 153, but as the disc 39 is rotated leftward by the rewindoperation, the projection 40b is pushed by the end 153a of the lever 153within one revolution of the disc 39 so that the hook 40a is displacedrightward and the engagement with the projection 39a of the disc 39 isreleased.

As the gear 37 is rotated reversely, a shaft 164 and a pulley 165 arerotated in the direction of the arrow. A belt 166 is reeved aroundpulleys 165 and 158 with an appropriate tension given by a roller 167.Accordingly, the rotation of the pulley 165 is transmitted to the pulley158 which rotates the shaft 159.

The sprocket 49 can freely rotate at this time and the spool 29 ispermitted to rotate reversely by the slip of the friction mechanism 43as is done in the known device. At the end of the film rewind operation,a roller 801 which has been rotating by the abutment to the film 28 isno longer pushed by the film 28. As a result, a switch SW16 pushes alever 802 and is turned on.

Thus, the motor 600 is stopped by the control circuit.

Then, the rewind lever 155 is returned to the position shown in FIG. 1.Thus, the fork 161 descends and the switch SW14 is turned off. The gear42 has an antireverse rotation pawl 189. In this manner, the rewindoperation is completed.

The multi-exposure photographing operation is now explained. Since thecamera is always stopped at the film feed completion state, a commandfor the multi-exposure is given before the first exposure. When amulti-exposure lever 171 is rotated clockwise, a lever 173 is rotateduntil it abuts against a pin 174. The lever 173 is held by a mechanismnot shown at a position to push an arm 65b of the lever 65 leftward. Asa result, the arm 65a is retracted from the engage position with the pin37a mounted on the gear 37. Accordingly, the lever 9 is not rotated bythe levers 65 and 56.

As the lever 173 is moved, a switch SW2 which has been on is turned off.The function of the switch SW2 will be explained later.

As the motor 600 is energized, the pin 37a mounted on the gear 37 isrotated leftward around a shaft 177 of a lever 176 so that a switch SW3is turned on and the motor 600 is deenergized by the control circuit. Itoccurs before the disc 39 engages with the pawl 40. The switch SW5 iskept off. Thus, the first exposure is completed.

The second exposure is carried out by returning the lever 171 andreturning the lever 65 and depressing the release button 100.

If a user forgets to return the lever 171 before the last exposure ofthe multi-exposure the film is not fed after the last exposure and theexposure is again made on the same frame.

FIG. 5 shows a modification in which the return operation of the lever171 is done after the last exposure of the multi-exposure.

A cam 651 is fixed at the bottom end of the lever 171. As the lever 171is rotated, the cam 651 is rotated to ride over a lever 652 while itrotates a rocking lever 652 around a shaft 653. The lever 652 isreturned to a position to couple to a pin 655a by a spring 654. Duringthis period, the lever 173 rotates the lever 65 leftward to retract thearm 65a thereof from the rotation path of the pin 37a shown in FIG. 1. Abiasing force of a spring 657 serves to prevent the movement of a lever655 during the clockwise rotation of the cam 651.

After the last exposure of the multi-exposure, the lever 171 is returnedand the cam 651 catches an end 652a of the lever 652 and pushed it toimpart a clockwise moment to the lever 652 around the shaft 653. Thismoment is converted to a moment to a lever 655 around a shaft 656through the engagement of the cam 651 and the pin 655a so that the lever655 is rotated.

As a result, a pin 658 mounted on the lever 655 rotates the lever 56 andthe lever 9.

The switch SW5 shown in FIG. 1 is turned on at this time and the filmfeed is started by the control circuit. The frame exposed is moved asthe film 28 is wound on the spool 29 and the next unexposed frame isbrought to face an aperture not shown.

Now, the photographing sequence is summerized in accordance with a timechart shown in FIG. 6. When the film counter indicates "1", an object isdecided and the switch SW6 is turned on. Then, the motor 600 is rotatedforwardly and the stop drive system and the shutter charge system areactivated so that the mirror holding frame 132 is raised from a viewingposition to the photographing position. As the mirror is raised, theswitch SW7 is turned on and the motor is stopped. Then, the leadingcurtain 115 and the trailing curtain 115' which have been charged forthe exposure are driven and exciting currents to the magnets 135 and135' are turned on.

When the drive of the trailing curtain is completed, the switch SW4 isturned on and the motor starts to be rotated reversely. As a result, themirror descends and the stop is fully opened. The motor continues to berotated reversely to drive the wind-up system so that the film is fedone frame. During this period, the drive system, the shutter chargesystem and the mirror drive system are not activated. The reverserotation of the motor is stopped when the switch SW5 is turned off.After all of the frames have been exposed, the button 7 is depressed torelease the engagement of the pin 47a and the groove 45a and disconnectthe motor from the wind-up system, and the rewind coupling 161 isengaged with the film magazine. In the rewind operation, the switch SW14in FIG. 1 is turned on to start the rewind operation and the motor isrotated reversely to store the exposed film in the magazine. When thewind-up is completed, the switch SW16 is turned on and the motor isstopped. In the multi-exposure operation, when the switch SW3 is turnedon, the reverse rotation of the motor is stopped and the subsequentoperation is blocked.

A silent mode or low speed mode in which the camera device is operatedvery silently is now explained.

FIG. 7 shows an external view of the camera. Numeral 401 denotes a leverof a speed selection switch. It can select one of three ranges H, N andL as shown in FIG. 8.

When the lever 401 is set to face to an index L, only the mirror returnoperation, the stop opening operation and the film feed operation areoperated at a low speed. Thus, the times required for the stop controland the mirror drive are not changed and the user can exactly catch ashutter chance, and the precision of the stop control does not change.On the other hand, the noise after the photographing, which occupiesmost portions of the operation noise of the camera is extremely reduced.

The silent mode can also be applied to feed the film slowly in order toprevent breaking of the film when the camera is used in a very coldarea.

When a battery pack 403 shown in FIG. 9 which is exchangeably attachedto a camera body 404 is exchanged with a high power pack 405 shown inFIG. 10 which supplies a higher voltage, a contact arm 411 of a switchSW11 in the camera body is switched from a terminal 408 to a terminal407. Because effective heights h of positioning reference pins 409 and409' mounted on the packs 403 and 405 are different, they push or do notpush an insulation member 411a at the end of the contact arm 411 whenthey are attached to the camera body.

Numerals 412 and 412' denote terminals for feeding the power to thecamera.

When the switch SW11 is at a position shown in FIG. 11 and the lever 401of FIG. 8 is switched to the position H, a switch in the camera to bedescribed later is switched so that the mirror return operation, thestop opening operation and the film feed operation are carried out at ahigh speed.

Accordingly, the time required for one cycle of photographing operationcan be reduced without changing the time required for the stop controloperation and the mirror drive operation.

FIG. 12 shows an embodiment of the circuit for controlling themechanisms of FIG. 1. Switches SW1, SW2, SW3, SW4, SW5, SW6, SW7, SW13,SW14, SW15, SW16 and SW17 correspond to those shown in FIG. 1.

The switch SW8 is switched to a position S (on) when a selection lever,not shown, selects a one-frame photographing mode, and switched to aposition C (off) when it selects a continuous photographing mode tocontrol the one-frame photographing or the continuous photographing.

As shown in FIGS. 8 and 9, the switch SW9 is linked to the lever 401 ofthe speed selection switch so that a terminal a or a terminal b isselected. It selects the terminal b when the lever selects the maximumspeed, and selects the terminal a in other cases. A variable resistorVR₂ for varying the motor speed and a variable resistor VR₃ for varyinga detection time of a film end detection timer are also linked to thelever 401. The resistor VR₂ increases a resistance thereof as the leverselects the higher motor speed and the resistor VR₃ reduces a resistancethereof as the lever selects the higher motor speed.

The switch SW10 is a main power switch.

The switch SW11 corresponds to the switch shown in FIG. 11. In thepresent embodiment, when an external connector is plugged into anexternal power supply connector 605 shown in FIG. 12, the switch SW11 isautomatically switched to the connector 605.

A D.C. tachogenerator 601 not shown in FIG. 1 is coupled to the shaft ofthe motor 600. A polarity of the generated voltage changes depending onthe direction of the rotation of the motor. When the motor 600 isrotated reversely, the output of the tachogenerator 601 is positive at ajunction of diodes D₁ and D₂, and when the motor is rotated forwardly(in the direction of the arrow), the output is positive at a junction ofdiodes D₃ and D₄. At each polarity, the generated voltage isproportional to the rotating speed of the motor. Magnets Mg₁, Mg₂ andMg₃ correspond to the magnet coils 85, 135 and 135' of FIG. 1,respectively. A variable resistor VR₁ corresponds to the potentiometerconsisting of elements 302 and 303 of FIG. 1.

(1) Circuit operation in the film loading

(1)-1 When the rear cover is open:

As explained before in connection with FIG. 1, the switch SW12 is off,the switch SW17 is on and the switch SW5 is on. Since the rewind lever155 is at the normal position, the switch SW14 is off. It is assumedthat the switch SW9 is connected to the terminal a. When the push button100 is depressed under this condition, the switch SW13 is turned on anda transistor Q₁₁ is rendered conductive through a resistor R₈ and thecircuit is energized. In FIG. 12, those circuits which have noindication of a power line are energized through the transistor Q₁₁. Asthe transistor Q₁₁ is conductive, a transistor Q₁₂ is also conductive,but since the switch SW12 is off, it does not affect to the control bythe transistor Q₁₁. Thus, the circuit is energized only when the pushbutton switch SW13 is on. As the circuit is energized, at an early stageof the energization, an output of an inverter INV₄ assumes an L-levelfor a predetermined period determined by a resistor R₁ and a capacitorC₁ and flip-flops (G₇, G₈) (G₂₀, G₂₁) and (G₂₆, G₂₇) are reset and otherdigital circuits not shown are also reset. By the reset operation, anoutput of a NAND gate G₇ is L, an output of the gate G₈ is H and anoutput of the gate G₂₀ is L. As explained in FIG. 1, since the wind-uplimit switch SW5 is held on, an output of a gate G₃ is H, and an outputof an inverter INV₁ is L. Accordingly, an output of an gate G₆ is held Hso that the flip-flop (G₇, G₈) is not set by the push button switch SW6to be described later.

Since the rewind switch SW14 is off, an output of an inverter INV₁₃ isL, outputs of AND gates G₁₆, G₁₇, G₂₃ and G₃₁ are L and an output of agate G₃₂ is H. An output of an inverter INV₅ is H because the output ofthe NAND gate G₇ is L. Since all inputs to an AND gate G₉ are H, anoutput thereof is H and an output of a NOR gate G₁₀ is L. Since atransistor Q₁₆ is non-conductive, a capacitor C₆ is charged through theresistor VR₃ but an output of a comparator A₂ is held H until thevoltage of the capacitor C₆ reaches a predetermined voltage, that is,until a predetermined period determined by a time constant circuit VR₃and C₆ is elapsed. Accordingly, an output of an AND gate G₁₃ is L andoutputs of an AND gate G₁₄ and an OR gate G₁₅ are H. The H-output of theOR gate G₁₅ renders a transistor Q₁₀ conductive through a diode D₆ toshort a capacitor C₁₁ to discharge it and holds a transistor Q₉non-conductive. At the same time, a transistor Q₆ is biased toconductive state through a resistor so that transistors Q₁ and Q₇ areturned on. Since the output of the AND gate G₁₃ is L, transistors Q₃, Q₄and Q₂ are non-conductive. As a result, a current flows to the motor 600from a battery Ep through the transistor Q₁, the motor 600 and thetransistor Q₇. Thus, the motor 600 is rotated reversely. As the motor600 is rotated reversely, the D.C. tachogenerator 601 is also rotated inthe same direction and a current flows into the resistor VR₂ and aresistor R₇ through the diodes D₁ and D₄. As the rotating speed of themotor 600 increases, the voltage across the resistor R₇, that is, avoltage at a (+) input terminal of a comparator A₁ increases, and whenit exceeds a reference voltage of a power supply Es, an output of thecomparator A₁ assumes H and transistors Q₅ and Q₈ are turned on. As thetransistor Q₈ is conductive, the transistor Q₆ is turned off and thetransistors Q₁ and Q₇ are also turned off. Therefore, the motor 600 isdeenergized and the rotating speed is reduced. Since the rotation of themotor 600 is velocity fed back, the rotating speed is controlled to apredetermined speed determined by the resistance preset by the resistorVR₂. The velocity feedback is effected when the switch SW9 selects theterminal a in accordance with the lever 401 of the speed selectionswitch. When the switch SW9 selects the terminal b, that is, the maximumspeed, the generated voltage of the D.C. tachogenerator 601 is notsupplied and the velocity feedback is not effected. Thus, the motor 600is rotated at the maximum speed determined by the voltage of the powersupply E_(B). Under this condition, the on and off states of thetransistor Q₁₇ does not contribute to the control operation. When thepush button switch SW13 is turned off or when the predetermined perioddetermined by the time constant circuit VR₃ and C₆ has elapsed, thetransistors Q₆ and Q₁₀ are turned off, and when a predetermined perioddetermined by the resistor and capacitor C₁₁ has elapsed, the transistorQ₉ is turned on so that only the transistors Q₁ and Q₂ are conductivethrough diodes D₉ and D₁₀. Since the motor 600 has been rotatedreversely, the motor 600 is shorted by a diode D₇ and the transistor Q₂so that it is braked and rapidly stopped. After the motor 600 has beenstopped, the capacitor C₁₁ is charged up and the transistor Q₉ is turnedoff and the transistors Q₁ and Q₂ are also turned off. Under thiscondition, the motor 600 is rotated reversely while the switch SW13 ison when the on-time of the switch SW13 is within the predeterminedperiod determined by the resistor VR₃ and the capacitor C₆, and for thepredetermined period when the on-time of the switch SW13 is longer thanthe predetermined period.

When the rear cover is open, the switch SW17 is on and the referencevoltage applied to the (+) input terminal of the comparator A₂ is lowerthan that when the switch SW17 is off. Thus, for a given setting of theresistor VR₃, a time required for the output of the comparator A₂ to bechanged to L when the switch SW17 is on is shorter than that when theswitch SW17 is off. This is because a timer period by a timer circuitVR₃, C₆ and A₂ should be longer than a time period necessary to wind upthe film to the first frame exposure position after the rear cover isclosed. On the other hand, if the timer period is long when the rearcover is open, and if the on-time of the switch S₁₃ is long, the film iswound on the spool excessively and the film is wasted. This happensparticularly when the film is loaded under the high speed wind-upcondition in which the switch SW9 selects the terminal b and amanipulation of the push button by the user does not follow the wind-upspeed of the spool. It also happens by a careless manipulation. In orderto avoid the above inconvenience, when the rear cover is open, theswitch SW17 is turned on to lower the reference voltage and shorten thetimer period. The timer period is set to approximately one revolutiontime of the spool 29 shown in FIG. 1 and it is controlled in associationwith the motor speed by the resistor VR₃ which is set in associationwith the motor speed. Accordingly, in a normal operation, the leader ofthe film is inserted into the spool 29 and the push button 100 iscontinuously depressed. Thus, a required amount of film is wound.

(1)-2 When the rear cover is closed:

When the rear cover of the camera is closed after the film 28 has beenwound on the spool 29 by the operation of (1)-1, the leader of the filmis wound so that the first frame of the film is brought to the exposureposition. It is carried out in the following manner. When the rear coveris in the closed position, the switch SW12 is turned on and the switchSW17 is turned off and the switch SW5 remains on. When the push button100 is depressed under this condition, the switch SW13 is turned on andthe transistor Q₁₁ is rendered conductive. Thus, the circuit isenergized and the motor 600 is rotated reversely by the same reason asthe operation of (1)-1. After the switch SW13 is turned off, theon-state of the transistor Q₁₁ is held for a predetermined period(normally 20 seconds to several minutes) determined by a resistor R₈ anda capacitor C₁₂ by the positive feedback of the transistor Q₁₂, and thecircuit is continuously energized.

When the film is fed to the first frame exposure position, the switchSW5 is turned off. The trailing shutter curtain switch SW4 is on and theswitch SW1 is on. Accordingly, the outputs of the AND gates G₁ and G₂are held L. Thus, when the wind-up switch SW5 is turned off, the outputof the OR gate G₃ is changed to L and the outputs of the AND gates G₉and G₁₄ and the OR gate G₁₅ are changed to L so that the motor 600 israpidly stopped. Thus, the wind-up operation of the film leader iscompleted. The output of the NOR gate G₁₀ changes to H and thetransistor Q₁₆ is turned on. Accordingly, the capacitor C₆ of the timercircuit is reset. The resistor VR₃ is set in linked relation with theresistor VR₂ which sets the reverse rotating speed of the motor 600.Since the amount of wind-up of the film leader is constant by the filmcounter mechanism shown in FIG. 1, the wind-up time for the film leaderis determined based on the reverse rotating speed of the motor 600.Since the time period to the inversion of the output of the comparatorA₂ by VR₃ and C₆ is set longer than the wind-up time, the motor stopoperation by the inversion of the output of the comparator A₂ to L isnot effected during the normal wind-up operation of the film leader. Thepredetermined period in this case is longer than the predeterminedperiod described in the operation of (1)-1. It is controlled by the riseof the (+) reference voltage of the comparator A₂ because the switchSW17 is turned off when the rear cover is closed. If the film is stoppedin the course of the wind-up operation because of jam or the wind-upoperation is not effected by a trouble of the mechanism, the switch SW5is not turned off within the predetermined period determined by VR₃ andC₆. Thus, the output of the comparator A₂ changes to L and the motor 600is stopped, an output of an inverter INV₁₀ changes to H, an output of anOR gate 18 changes to H and a light emitting diode LED₂ is lit to issuean alarm. In the operation of (1) described above, the flip-flops (G₇,G₈) and (G₂₆, G₂₇) are not flipped and hence the exposure control to bedescribed in (2) is not effected. The wind-up speed is appropriatelyselected by the speed change lever 401 in the same manner as describedabove.

(2) Circuit operation in the photographing mode

(2)-1 Normal continuous photographing mode:

In the following description, it is assumed that the switch SW9 selectsthe terminal a and the switch SW8 selects the terminal C (off). Themultiphotographing selection switch SW2 selects the normal photographingmode and hence it is on. Thus, the output of the AND gate G₁ is held L.Since the mirror switch SW1 is on when the mirror is in the descendedposition, the output of the AND gate G₂ is also L. Since the switch SW5is off at the end of the wind-up operation of the film leader, theoutput of the OR gate G₃ is L and an output of a NAND gate G₃₀ and anoutput of the inverter INV₁ are H. When the push button switch SW6 isturned on by the actuation of the push button 100 of FIG. 1, an outputof an inverter INV₂ changes to H and the output of the AND gate G₄changes to H because the output of the NAND gate G₃₀ is H. Thus, anoutput of an inverter INV₃ changes from H to L. On the other hand, ifthe predetermined reset period determined by the time constant circuitC₁ and R₁ has been elapsed, the output of the inverter INV₄ is H, themirror stop switch SW7 is off when the mirror before it is released isin the descended position, the rewind switch SW14 linked to the rewindlever 155 of FIG. 1 is off and the rewind button switch SW15 is on.Therefore, the outputs of the AND gates G₁₆ and G₃₁ are L and the outputof the NOR gate G₃₂ is H. Since all inputs to an AND gate G₅ are H, anoutput thereof is H. As described above, the output of the inverter INV₁is also H. Accordingly, the output of the NAND gate G₆ is L for thepredetermined period determined by the time constant circuit R₂ and C₂after the push button switch SW6 has been turned on. Thus, the flip-flop(G₇, G₈) flips and the output of the NAND gate G₇ changes to H. Thepredetermined time determined by R₂ and C₂ need be a time periodrequired for the flip-flop (G₇, G₈) to flip, and after the flip theoutput of the NAND gate G₆ immediately returns to H. As the output ofthe NAND gate G₇ changes to H, the output of the inverter INV₅ changesto L to hold the output of the AND gate G₉ L and change the output ofthe NOR gate G₁₀ to L. As a result, the transistor Q₁₆ is turned off andthe clock of the timer circuit VR₃, C₆ and A₂ is started. At the sametime, the output of the AND gate G₁₃ changes to H and a transistor Q₃ isturned on, the transistors Q₂ and Q₄ are turned on and the transistorQ₁₀ is turned on through a diode D₅. Thus, the transistor Q₉ is heldoff. Since the output of the AND gate G₉ is held L, the output of theAND gate G₁₄ is L and the output of the AND gate G₁₆ is also L. Thus,the output of the OR gate G₁₅ is L and the transistors Q₆, Q₇ and Q₁ areoff. As the transistors Q₂ and Q₄ are turned on, a current flows intothe motor 600 in the path of Q₂ →motor 600→Q₄ and the motor 600 isrotated forwardly. Thus, the tachogenerator 601 is also rotatedforwardly, and the generated voltage is positive at the anode of thediode D₃. Thus, a current flows through the diode D₃ in the direction ofD₃ →R₆ →R₇ →D₂, and when a voltage across the resistor R₇ reaches thevoltage Es, the output of the comparator A₁ is inverted to turn on thetransistor Q₅. Thus, the velocity feedback control is effected in thesame manner as described above. The speed of the motor 600 is controlledsuch that a predetermined forward speed is attained at a ratio of R₆ andR₇. The setting speed is selected to a speed sufficient to assure thecontrol precision when the stop aperture is electrically controlled andthe speed is kept constant in order to keep the shutter release timingconstant. As the motor 600 is rotated forwardly, the shutter is chargedand the mirror is raised as explained in FIG. 1, and the switch SW4 isfirst turned off and then the switch SW4 is turned off. Thus, theoutputs of the gates G₂ and G₃ are kept L. On the other hand, when theswitch SW18 is turned off, an output of an OR gate G₁₁ changes to Hbecause the output of the gate G₇ is H and this state is held when themirror is raised to turn on the switch SW7, reset the flip-flop (G₇, G₈)and change the output of the gate G₇ to L, because the switch SW1 isoff. The H-level signal of the OR gate G₁₁ is transmitted to a terminalP₁ of an exposure control unit 604. While the terminal P₁ of theexposure control unit 604 is at the H-level, a known light measurementmemory in the exposure control unit 604 is activated to store a lightmeasurement of a photodiode PD which is a photosensitive element.Simultaneously with the turn-on of the push button switch SW6, the lightmeasurement is stored and it is held until the exposure is completed andthe mirror 132 of FIG. 1 descends. As the mirror 132 is raised, theswitch SW7 is turned on, the output of the AND gate G₅ changes to L, theoutput of the NAND gate G₆ is held H, the flip-flop (G₇, G₈) is resetand the output of the gate G₇ changes to L. When the push button switchSW6 is turned on and the output of the gate G₇ of the flip-flop (G₇, G₈)is H, an output of an AND gate G₁₉ can respond to an output at a stopcontrol signal terminal P₂ of the exposure control unit 604. In a modesuch as a shutter priority AE mode or a programmed AE mode in which thestop aperture is electrically controlled, the output at the terminal P₂changes from L to H when the desired stop aperture is reached based onthe stored light measurement in the exposure control unit 604, and theoutput of the AND gate G₁₉ changes to H. Thus, a transistor Q₁₄ isturned on so that a charge stored in a capacitor C₇ is dischargedthrough the stop control magnet Mg₁. As a result, the stop controlmechanism is actuated to adjust the stop aperture to the desiredaperture. The stop aperture feedback control for attaining the desiredstop aperture is effected by the resistor VR₁ connected to the exposurecontrol unit 604. The generated voltage of the tachogenerator 601 as themotor 600 is rotated forwardly is applied to a stopping down speedcompensation input terminal P₇ of the exposure control unit 604. This isbecause there is a steady delay determined by the characteristic of themagnet Mg₁ and the inertia of the engagement mechanism between theenergization of the stop control magnet Mg₁ and the engagement of thestop control mechanism, and if the compensation is not effected when therelation between the delay and the rotating speed of the motor 600 isnot fixed, the precision of the stop control is lost in the mode inwhich the stop is electrically controlled. Because of the inertia of thedrive mechanism including a rotor of the motor 600, a risecharacteristic of the speed before a constant speed is reached is finiteand the relation between the delay and the rotating speed of the motor600 is not fixed in that region. As a result, a control error isincluded and the rise characteristic is affected by the voltage of thepower supply E_(B). Accordingly, in order to eliminate the affect, thevoltage of the tachogenerator 601 related to the speed of the motor 600is transmitted to the exposure control unit 604 to compensate the stopcontrol. The compensation will be explained later in connection withFIG. 13. When a mode such as an aperture priority AE mode or a manualexposure setting mode in which the stop aperture is not electricallycontrolled is selected by the exposure mode selection means of theexposure control unit 604, the output at the terminal P₂ is kept L sothat the output of the AND gate G₁₉ is not changed to H and the stopaperture is not electrically controlled.

The switch SW18 is turned on to fix the memory of the light measurement.When the memory fixing switch SW18 is turned on, the output of the ORgate G₁₁ is held H so that the stored light measurement is continuouslyheld. Before the push button switch SW6 is turned on, the camera isdirected to an object a light measurement of which is to be fixed andthe switch SW18 is turned on. Thus, the light measurement iscontinuously stored. Thereafter, when the camera is directed to anotherobject and the push button switch SW6 is turned on, the auto-exposurecontrol is effected not by the light measurement of the object but bythe stored light measurement.

As the mirror is raised, the outputs of the gate G₇ of the flip-flop(G₇, G₈) changes from H to L, and while the mirror is in the raisedposition and the switch SW7 is on, the output of the AND gate G₅ is heldL and the output of the NAND gate G₆ is held H. Accordingly, theflip-flop (G₇, G₈) is inhibited from flipping while the mirror is in theraised position. When the output of the gate G₇ of the flip-flop (G₇,G₈) changes from H to L, the forward rotation of the motor 600 isstopped and it is not driven reversely because the output of the OR gateG₃ is L. Thus, the motor 600 is rapidly stopped by the turn-on of thetransistor Q₉ for the predetermined time. When the output of the gate G₇of the flip-flop (G₇, G₈) changes from H to L, an output of an inverterINV₆ changes from L to H after the predetermined period of the timeconstant circuit R₃ and C₃. As the output of the inverter INV₆ changesfrom L to H, an output of an AND gate G₁₂ changes to H for thepredetermined period determined by R₄ and C₄ so that a transistor Q₁₃ isturned on and a charge stored a capacitor C₅ is discharged through aleading shutter curtain control magnet Mg₂. Thus, the leading shuttercurtain 115 of FIG. 1 is moved to start the exposure. The predetermineddelay time determined by the time constant circuit C₃ and R₃ is usuallyset to an expected time for the motor 600 to be fully stopped becausethe motor 600 is not instantly stopped when it is braked. This assuresthat the vibration of the motor 600 does not influence to thephotographing. If the vibration is negligible, the delay time may bezero. A diode D₁₅ connected in parallel with the resistor R₃ and a diodeD₁₅ connected in parallel with a resistor R₄ serve to rapidly charge thecapacitors C₃ and C₄ and they are isolated during the discharge periodto give the predetermined delay times. As the leading shutter curtain ismoved by the turn-on of the transistor Q₁₃ for the predetermined period,an output of an inverter INV₈ changes from H to L, the output of thegate G₂₁ of the flip-flop (G₂₀, G₂₁) changes from L to H and the outputof the gate G₂₀ changes from H to L. Since an output of a gate G₂₂ doesnot change but remains L, a transistor Q₁₅ is off. The leading shuttercurtain start signal by the change of the output of the NAND gate G₂₁from L to H is transmitted to the input terminal P₃ of the exposurecontrol unit 604 so that a known shutter timer circuit in the exposurecontrol unit 604 is started.

In the automatic exposure mode such as aperture priority AE mode,shutter priority AE mode or programmed AE mode, the shutter timercircuit controls a shutter time calculated based on the stored lightmeasurement to start clocking from the leading shutter curtain startsignal supplied to the terminal P₃, and after the calculated time periodis timed up, a trailing shutter curtain start signal which changes fromH to L is produced at an output terminal P₄ which is supplied to theNAND gate G₂₀. The output signal at the terminal P₄ is held L before theleading shutter curtain start signal is supplied to the terminal P₃, andwhen it is supplied, the output signal at the terminal P₄ changes from Lto H, and when the shutter time circuit times up, the output at theterminal P₄ changes from H to L so that the trailing shutter curtainstart signal is produced. The L-state is held until the leading shuttercurtain start signal is again produced. In the manual exposure mode, theshutter time circuit operates at the shutter time selected by a shuttertime setting member, not shown, in the exposure control unit 604. Anon-off signal of the push button switch SW6 is supplied to an inputterminal P₄ of the exposure control unit 604.

If the shutter time selected in the manual exposure setting mode isbulb, the output at the terminal P₄ is independent from the shuttertimer circuit, and when the leading shutter curtain start signal issupplied to the input terminal P₃, the output at the terminal P₄ changesto H. Since the input to the terminal P₅ is H if the push button switchSW6 is off, the output terminal P₄ immediately produces the trailingshutter curtain start signal which changes from H to L. If the pushbutton switch SW6 is on, the input to the terminal P₅ is L and theoutput at the terminal P₄ is held H, and when the push button switch SW6is subsequently turned off, the input to the terminal P₅ changes to Hand the output terminal P₄ produces the trailing shutter curtain startsignal which changes from H to L.

When the output terminal P₄ produces the trailing shutter curtain startsignal, the output of the flip-flop (G₂₀, G₂₁) is flipped so that theoutput of the NAND gate G₂₀ changes from L to H and the output of theNAND gate G₂₁ changes from H to L and the output of the gate G₂₂ is Hfor the predetermined period determined by a time constant circuit R₅,C₈. Thus, the transistor Q₁₅ is turned on. As the transistor Q₁₅ isturned on, a charge stored in a capacitor C₉ is discharged through thetrailing shutter curtain control magnet Mg₃ so that the trailing shuttercurtain 115' of FIG. 1 is moved to terminate the exposure. When theswitch SW4 is turned on by the closure of the trailing shutter curtain115', the output of the gate G₂ changes to H because the switch SW1 isoff at this time, and the output of the AND gate G₉ changes to H throughthe OR gate G₃. Accordingly, the transistor Q₆ is turned on through theAND gates G₁₄ and G₁₅ and the motor 600 is rotated reversely. During theH-state of the output of the OR gate G₃, the output of the inverter INV₁is L. Thus, the flip-flop (G₇, G₈) is not flipped by the output of thegate G₆ to produce the forward rotation signal to the motor 600. As themotor 600 starts to be rotated reversely, the mirror drive control andthe stop control mechanism are reset at the early stage of the reverserotation as described in FIG. 1. When the mirror is descended by thereverse rotation of the motor, the switch SW1 is turned on and theoutput of the gate G₂ changes to L, but since the switch SW5 is turnedon earlier, the output of the gate G₃ is held H and the motor 600 iscontinuously rotated reversely. Since the output of the gate G₃ is heldH by the turn-on of the switch SW5, the reverse rotation of the motor600 continues and the film is wound up. When a predetermined amount offilm has been wound up, the wind-up limit switch SW5 is turned off andthe output of the gate G₃ changes to L and the reverse rotation of themotor 600 is stopped to terminate the wind-up of the film. During thereverse rotation of the motor, the rotating speed is determined by theresistor VR₂ and the switch SW9 as described above. When the output ofthe gate G₃ changes to L as the wind-up of the film terminates, theoutput of the inverter INV₁ changes to H. Since the mirror is in thedescended position, the switch SW7 is off and the output of the gate G₅is H. Thus, the NAND gate G₆ can respond to the output change of the ANDgate G₄. Since the switch SW8 is connected to the terminal C (off), whenthe output of the NAND gate G₃₀ changes from L to H at the end of thewind-up, the output of the AND gate G₄ changes from L to H if the pushbutton switch SW6 is on at that time. The output of the gate G₆ is L forthe predetermined period determined by the time constant circuit R₂, C₂and the flip-flop (G₇, G₈) is flipped to produce the motor forwardrotation signal. Thus, during the on-time of the push button switch SW6,the cycle of motor forward rotation (mirror rise, stopping down) →motorstop→shutter control→motor reverse rotation (mirror return, stopopening)→motor reverse rotation (film wind-up)→motor forward rotation(mirror rise, stopping down)→ . . . is repeated so that continuousphotographing is effected. When the push button switch SW6 is turnedoff, the output of the gate G₄ is held L because the output of theinverter INV₂ is L, and the motor is stopped at the completion of thewind-up of the film and the next photographing sequence is not started.Thus, the continuous photographing is terminated.

The operation when the switch SW9 selects the terminal b, that is, themaximum speed mode is now explained.

Before the push button switch SW6 is turned on, an output of a gate G₂₉is L and an output of a gate G₂₅ is held H so that the flip-flop (G₂₆,G₂₇) is forcibly reset and the output of the gate G₂₆ is L and an outputof a gate G₂₈ is also L. Accordingly, a transistor Q₁₇ is off. When thepush button switch SW6 is turned on, the output of the gate G₂₉ is heldH and the forced reset is released. The flip-flop (G₇, G₈) is flippedand the motor 600 is rotated forwardly to raise the mirror and controlthe stop, but since the AND gate G₁₂ does not produce the H-level pulseat this time, the output of the NAND gate G₂₅ remains H. Accordingly,the state of the flip-flop (G₂₆, G₂₇) does not change and the output ofthe gate G₂₆ is L, the output of the gate G₂₈ is L and the transistorQ₁₇ is off. Accordingly, the motor speed in the forward rotation is keptconstant by the velocity feedback. When the mirror has been raised, theswitch SW7 is turned on, the flip-flop (G₇, G₈) is reset, the motor isstopped and the output of the AND gate G₁₂ changes to H after thepredetermined period determined by R₃ and C₃. By the H-level output ofthe AND gate G₁₂, the leading shutter curtain is moved to start theexposure and the output of the NAND gate G₂₅ changes to L and theflip-flop (G₂₆, G₂₇) is set so that the output of the gate G₂₆ changesto H. An output at an exposure mode output terminal P₆ of the exposurecontrol unit 604 is L in the mode such as shutter priority AE mode orprogrammed AE mode in which the stop is electrically controlled, and itis H in the mode such as aperture priority AE mode or manual exposuresetting mode in which the stop is not electrically controlled.

Accordingly, in the shutter priority AE mode or the programmed AE mode,the output of the AND gate G₂₈ is held L independently from the outputstate of the NAND gate G₂₆, but in the aperture priority AE mode or themanual exposure setting mode, the output of the AND gate G₂₈ depends onthe output state of the NAND gate G₂₆. Assuming that the aperturepriority AE mode or the manual exposure setting mode is selected, whenthe flip-flop (G₂₆, G₂₇) is set and the output of the NAND gate G₂₆changes to H, the output of the AND gate G₂₈ changes to H and thetransistor Q₁₇ is turned on. As the transistor Q₁₇ is turned on, thevelocity feedback control to the rotation of the motor 600 is ceased.The trailing shutter curtain is controlled and the exposure is effected.Then, the motor 600 is rotated reversely to descend the mirror and windup the film. Since the switch SW9 now selects the terminal b or themaximum speed, the velocity feedback control is not effected and themotor is rotated at the maximum speed depending on the voltage of thepower supply E_(B). At the end of the wind-up, if the push button switchSW6 is on, the flip-flop (G₇, G₈) is again set and the motor 600 isrotated forwardly to prepare for the next frame photographing. Becausethe transistor Q₁₇ is on, the constant velocity control is not effectedand the motor is rotated at the maximum speed. Thereafter, while thepush button switch SW6 is continued to be depressed to allow thecontinuous photographing, the on-state of the transistor Q₁₇ is held andthe velocity feedback is not effected and the motor 600 is rotated atthe maximum speed. When the push button switch SW6 is turned off, thecontinuous photographing mode is stopped with the wind-up of the filmcompleted and the output of the NAND gate G₂₉ changes to L. Thus, theflip-flop (G₂₆, G₂₇) is reset and the outputs of the NAND gates G₂₆ andG₂₈ are L and the transistor Q₁₇ is turned off. When the switch SW6 isagain turned on, the velocity feedback control is effected in theforward rotation of the motor for the first one frame photographing butthe velocity feedback is not effected in the rotation of the motor inthe following continuous photographing mode and the maximum speedrotation is attained. In the shutter priority AE mode or the programmedAE mode, the output at the terminal P₄ of the exposure control unit 604is L and the output of the gate G₂₈ is held L. Thus, the transistor Q₁₇remains off and the constant velocity feedback control is effectedduring the forward rotation of the motor, but the motor is rotated atthe maximum speed during the reverse rotation.

As described above, only when the maximum speed continuous photographingmode is selected in the aperture priority AE mode or the manual exposuresetting mode, the constant velocity control is effected in the forwardrotation at the first release of the continuous photographing mode, andin the subsequent continuous photographing mode, the motor is rotated atthe maximum speed both for the forward rotation and the reverserotation. An advantage thereof is that since a release timing for thefirst frame in the continuous photographing mode is set by a user of thecamera, it is desirable that the motor speed is constant in any mode,while since the timing in the subsequent continuous photographing modeis determined by the camera, the motor need not be rotated forward atthe constant speed and unnecessary time is saved so that high speedcontinuous photographing is attained. In the shutter priority AE mode orthe programmed AE mode, the stop is electrically controlled during theforward rotation of the motor. Therefore, the rotating speed should becontrolled to a predetermined speed in order to assure the precision ofthe stop control. Accordingly, the constant velocity feedback control isalways effected during the forward rotation.

The photographing mode can be terminated at any time during thecontinuous photographing mode by turning off the push button switch SW6.If it occurs during the forward rotation of the motor, the motorcontinues to be rotated forwardly until the frame is exposed and thefilm is wound up, and the inhibition of the velocity feedback by theon-state of the transistor Q₁₇ is continued, and when the wind-up iscompleted, a reset signal to the flip-flop (G₂₆, G₂₇) is generated.Thus, the gate G₂₉ of the flip-flop is controlled by the output of thegate G₂₈.

(2)-2 Normal one-frame photographing mode:

In this mode, the switch SW8 selects the terminal S. The multi-exposureselection switch SW2 selects the normal photographing mode (on) and theoutput of the gate G₁ is held L. The operation in this mode is same asthat in (2)-1 except the re-release operation by the on-state of thepush button switch SW6 is not effected in synchronism with thecompletion of the wind-up of the film. Since the switch SW8 selects theterminal S (on), the output of the gate G₃₀ is held H. Since the outputof the gate G₄ responds only to the push button switch SW6 withoutregard to the output of the gate G₃, if the push button switch SW6 isturned on when the output of the gate G₅ and the output of the inverterINV₁ are H, the output of the gate G₄ changes from L to H and the gateG₆ produces an L output for the predetermined period determined by R₂and C₂ to flip the flip-flop (G₇, G₈) so that the release operation isstarted by the forward rotation of the motor. Even after the exposurecontrol and the wind-up of the film have been completed, the output ofthe gate G₄ is held H while the push button switch SW6 is held on, andonly when the output of the gate G₄ changes from L to H, the output ofthe gate G₆ changes to L for the predetermined period determined by R₂and C₂ and thereafter it is held H and the output of the gate G₆ doesnot change to L. In order to re-release, the push button switch SW6 isturned off to charge up the capacitor C₂. When the push button switchSW6 is turned on after the recharge of the capacitor C₂, the output ofthe NAND gate G6 changes to L to start the re-release operation if theoutput of the AND gate G₅ and the output of the inverter INV₁ are H.Thus, each time when the push button switch SW6 is turned on, theexposure is made frame by frame. In the one-frame photographing mode,the switch SW8 is on and the output of the NAND gate G₂₅ is held H.Thus, the flip-flop (G₂₆, G₂₇) remains reset and is not flipped and thetransistor Q₁₇ is always off. Accordingly, even when the switch SW9selects the terminal b or the maximum speed mode, the constant velocityfeedback control is effected to the forward rotation of the motor. Thisis because it is desirable to set the constant speed of the motor in anymode because the release timing is set by the user of the camera eachtime not only in the mode in which the stop is electrically controlledbut also in the mode in which the stop is not electrically controlled.Accordingly, in the forward and reverse rotations of the motor, therotating speed of the motor 600 is controlled in accordance with theindependently set speeds.

(2)-3 Multi-exposure continuous photographing mode:

In this mode, the switch SW8 selects the terminal C (off) and themulti-exposure selection lever 171 of FIG. 1 is in the multi-exposureposition. Thus, the switch SW2 is off and the switch SW5 is held off inthe multi-exposure position. It is assumed that the switch SW9 selectsthe terminal a. Since the switch SW2 is off, an H-level signal issupplied to a multi-exposure alarm circuit (OSC) 602 which produces aflashing signal to a light emitting diode LED1 to alarm themulti-exposure mode. The LED1 is preferably arranged in a view finder ina known manner. In the film wind-up completion condition prior toreleasing, the switch SW1 is on, the switch SW3 is on, the switch SW4 ison, the switch SW5 is off and the switch SW7 is off. Accordingly, theoutputs of the gates G₁, G₂ and G₃ are L. Since the outputs of theinverter INV₁, the gate G₅ and the gate G₃₀ are H, when the push buttonswitch SW6 is turned on, the output of the gate G₆ changes to L for thepredetermined period and the flip-flop (G₇, G₈) is flipped to producethe motor forward rotation signal. As the motor is rotated forwardly,the mirror is raised and the stop control is effected, and when themirror reaches a predetermined position, the switch SW7 is turned on. Asa result, the flip-flop (G₇, G₈) is reset and the motor is stopped andthe exposure by the shutter is started. When the trailing shuttercurtain is closed, the switch SW4 is turned on, and since the outputs ofthe gates G₂ and G₁ are H, the output of the gate G₃ changes to H andthe motor 600 is rotated reversely to descend the mirror and reset thestop control mechanism. As the mirror descends, the switch SW1 is turnedon and the output of the gate G₂ changes to L, but since the switch SW3is off until a predetermined phase immediately before the wind-up of thefilm starts, the output of the gate G₁ is H and the reverse rotation ofthe motor continues. At the predetermined phase immediately before thewind-up of the film starts, the switch SW3 is turned on and the outputof the gate G₁ changes to L. By the L-state output of the gate G₁, thereverse rotation of the motor is stopped and the outputs of the inverterINV₁ and the gate G₃₀ change from L to H. Thus, like the operation of(2)-1, if the push button switch SW6 is on at that moment, the output ofthe gate G₄ changes from L to H and the output of the gate G₆ changes toL for the predetermined period determined by R₂ and C₂, and the flipflop (G₇, G₈) is flipped to produce the motor forward rotation signal sothat the release operation is again started. Accordingly, while the pushbutton switch SW6 is on, the film is not fed and the multi-exposure isrepeated, and when the push-button switch SW6 is turned off, the film isstopped at the phase immediately before the wind-up, and when thepush-button switch SW6 is again turned on, the multi-exposure iseffected any times.

In accordance with the embodiment of FIG. 5, when the multi-exposuremode is returned to the normal photographing mode, the switch SW6 isturned on, the output of the gate G₃ changes to H and the motor reverserotation signal is produced. Thus, the film is wound up and when thepredetermined amount of film has been wound up, the switch SW5 is turnedoff and the rightward rotation of the motor is stopped.

The operation when the switch SW9 selects the terminal a is similar tothat of (2)-1. That is, the constant velocity feedback control iseffected in both the forward rotation and the reverse rotation of themotor.

When the switch SW9 selects the terminal b, the operation is similar tothat of (2)-1. That is, in the aperture priority AE mode and the manualexposure setting mode, at the first exposure after the turn-on of theswitch SW6, the forward rotation of the motor is constant velocitycontrolled in order to keep the release timing constant, and thesubsequent reverse rotation is effected at the maximum speed because thevelocity feedback is not effected, and the following forward and reverserotations for the continuous multi-exposure are effected at the maximumspeed without the velocity feedback. In the shutter priority AE mode andthe programmed AE mode, the constant velocity control is effected duringthe forward rotation.

(2)-4 One-frame multi-exposure mode:

This mode is attained by switching the switch SW8 to the terminal S (on)in the operation of (2)-3. In this mode, the output of the NAND gate G₃₀remains H and the release operation is similar to that of (2)-2. Thatis, when the output of the AND gate G₅ is H and the push button switchSW6 is on, the flip-flop (G₇, G₈) is flipped so that the motor isrotated forward to start the releasing operation of the camera. Even ifthe push button switch SW6 is continuously on, the exposure iscompleted, the mirror has descended and the camera is stopped at acondition immediately before the film is fed. If the push button switchSW6 is turned off and then on in order to re-release, multi-exposure iseffected. In order to return the mode from the multi-exposure mode tothe normal exposure mode, the lever 171 is returned to the normalphotographing position as described in (2)-3. In the one-framemulti-exposure mode, the motor is always constant velocity controlledindependently from the state of the switch SW9 and the exposure modesuch as the shutter priority AE mode or the aperture priority AE mode,by the same reason as that described in (2)-2, and the reverse rotationis effected at any selected speed.

(3) Operation at the end of the film

The film end operation is effected in the film feed sequence in thenormal photographing mode. When the film can no longer be pulled out ofthe magazine at the end of the film during the film feed, thepredetermined amount of film is not wound up and the switch SW5 remainsoff. As a result, the output of the comparator A₂ changes to L after apredetermined period corresponding to the selected wind-up timedetermined by the resistor VR₃, the capacitor C₆ and the comparator A₂so that the outputs of the AND gates G₁₃ and G₁₄ are held L to stop themotor. Since the output of the inverter V₁₀ changes to H and the outputof the OR gate G₁₈ changes to H, the alarm light emitting diode LED₂ islit to alarm the auto-stop of the motor.

(4) Operation in the film rewind

The operation procedes in the following manner as explained in FIG. 1.When the rewind button 7 is first depressed and the rewind lever 155 isset to the rewind position, the rewind operation is started. Bydepressing the rewind button 7, the switch SW15 is turned off, and asthe rewind lever is set to the rewind position, the switch SW16 is offif the film is not exhausted and the output of the gate G₁₆ changes toH. Since an output of the inverter INV₁₂ is L, the output of the gateG₁₇ is L and the rewind alarm circuit 603 is not activated and theoutput to the OR gate G₁₈ is L. Since the switch SW14 is on, an outputof a gate G₂₄ is L. The output of the gate G₂₃ is L because the outputof the inverter INV₁₄ is L because the switch SW16 is off. As the outputof the gate G₁₆ changes H, the output of the gate G₁₅ also changes to Hand the motor starts to be rotated reversely to rewind the film. Sincethe output of the gate G₁₆ is H, the output of the NOR gate G₃₂ is heldL and the output of the gate G₅ is also held L. Thus, the flip-flop (G₇,G₈) is held reset so that it does not produce the motor forward rotationsignal.

An inverter INV₁₁ produces an inhibit signal such that if the filmrewind is erroneously set when the switch SW1 is off, that is, while themirror is in the raised position for the exposure, the film is notinstantly rewound but the motor is rotated reversely to rewind the filmafter the exposure has been completed and the mirror has descended. TheL-output of the NOR gate G₃₂ in the rewind state holds the output of thegate G₉ L. Thus, when the film rewind is started, the transistor Q₁₆ isheld on and the timer circuit (VR₃, C₆ and A₂) is deactuated during therotation of the motor. While the switch SW14 is on, the transistor Q₁₁is rendered on through a diode D₁₁ to keep the feeding to the circuit.

When the film rewind is completed, the switch SW16 is turned on and theoutput of the gate G₁₆ changes to L and the output of the gate G₃₁changes to H. Thus, the output of the gate G32 remains L and the outputof the gate G₉ is held L and the flip-flop (G₇, G₈) is held reset. Thus,the motor is stopped and the output of the gate G₂₃ changes to H and thelight emitting diode LED₂ is lit to alarm the end of the rewind. If therewind lever is set to the rewind position without depressing the rewindbutton, the output of the gate G₁₆ is L and the output of the gate G₁₇is H. Therefore, the rewind alarm circuit 603 is activated to flash thelight emitting diode LED₂ to alarm that the rewind is disabled.

In the film rewind operation, the push button switch SW6 is normallyoff, the flip-flop (G₂₆, G₂₇) is in the reset state and the transistorQ₁₇ is off. When the switch SW6 is kept on and the flip-flop (G₂₆, G₂₇)is in the set state, the output of the gate G₃₂ is L in the rewindoperation and the output of the gate G₂₈ is also L. Thus, the transistorQ₁₇ is off. Accordingly, the motor speed in the rewind operation is at aspeed set by the speed change lever.

In the embodiment shown in FIG. 12, the velocity feedback control iseffected by detecting the speed by the D.C. tachogenerator in order tocontrol the motor speed constant. However, the present invention is notlimited thereto. For example, it is apparent that the velocity feedbackcontrol may be effected by known means which pulsatively detects therotating speed of the motor by a photo-electric device, a magneticsensor or a mechanical contact. While the present embodiment illustratesanalog constant velocity control, this method may require a large heatburden to the power transistors Q₁, Q₂, Q₄ and Q₇ which control themotor current depending on the voltage of the power supply E_(B) andhence the high efficiency heat dissipation of the high power transistorsis required. This is troublesome in reducing the size of the camera. Inorder to resolve the above problem, the transistors Q₁, Q₂, Q₄ and Q₇may be pulsatively turned on and off and an on-off duty factor iscontrolled by a pulse width modulation technique. As a result, the heatgeneration is minimized and small size transistors can be used.

FIG. 13 shows an embodiment of the exposure control unit 604 of FIG. 12,particularly a stopping velocity compensation circuit. In FIG. 13,elements similar to those shown in FIG. 12 are designated by the likenumerals. A logarithmic compression circuit 610 converts a currentmeasured by a photo-diode PD to a logarithmically compressed voltage. Amemory circuit 611 stores an output of the logarithmic compressioncircuit 610 when the H-output of the OR gate G₁₁ is supplied through theterminal P₁. An arithmetic circuit 612 receives the outputs of thememory circuit 611, a film sensitivity setting circuit 613, a presetaperture value and minimum aperture value detection circuit 614 and ashutter time setting circuit 615 and operates them in accordance with amode selected by a mode selector 617 and produces a display output of anexposure setting to a display circuit 616, an output to specify ashutter time by a shutter timer circuit 618 and a stop aperturespecifying output for the stop control. When the aperture priority AEmode or the manual exposure setting mode is selected, the mode selector617 produces the H-level output at the terminal P₆, and when theprogrammed AE mode or the shutter priority AE mode is selected, itproduces the L-level output. Numeral 619 denotes a stopping velocitycompensation circuit which comprises an in-phase amplifier circuit A₁₀,R₁₀, R₁₁ for amplifying the voltage generated by the tachogenerator andsupplied through the terminal P₇ and a differential amplifier A₁₁, R₁₂,R₁₃, R₁₄, R₁₅ which receives the controlling stop aperture voltagesupplied from the arithmetic circuit 612 and the output voltage of theamplifier A₁₀. The controlling stop aperture voltage from the arithmeticcircuit 612 increases as a target stop aperture is reduced. Es denotes areference voltage and VR₁ denotes the variable resistor which is linkedto the stop control lever, and Is denotes a constant current sinksource. The resistance of the resistor VR₁ is reduced as the stopaperture is reduced. As a result, a voltage at the junction of theresistor VR₁ and the constant current sink source Is increases as thestop aperture is reduced. A₁₂ denotes a comparator. When the voltageacorss the resistor VR₁ is equal to or higher than the output from thestopping velocity compensation circuit 619, the output of the comparatorA₁₂ assumes H to produce a stop latch signal at the terminal P₂. As themotor speed increases, the output of the stopping velocity compensationcircuit 619 decreases below the output of the arithmetic circuit 612.That is, it is corrected in accordance with the motor speed toward thefull open position from the target stop aperture of the arithmeticcircuit 612. Since the resistor VR₁ changes toward the stopped positionfrom the full open position, the stop latch signal of the comparator A₁₂is produced earlier than the resistor VR₁ reaches the target stop valueproduced from the arithmetic circuit 612 as the motor speed increases.The higher the motor speed is, the earlier the stop latch signal isproduced. Thus, the delay of the latch of the stop latch mechanism iscompensated and the precise stop control is attained.

As described above, in accordance with the present embodiment, means fordiscriminating the timing of the shutter operation is provided and thepositive change of the motor speed is prevented during the time periodfrom the release operation to the shutter operation, and the change ofthe film feed speed from the very low speed to the high speed ispermitted during the preparation period for the next photographing afterthe shutter operation.

When the film leader is wound up after the film has been loaded or whenthe film is rewound after the completion of the photographing, a problemof operation noise may arise. Conversely, it may be desired to rapidlywind or rewind the film. Therefore, the speed is variable in order tocomply with such a requirement.

In accordance with the present embodiment, since the stopping velocityis suppressed by the speed control of the motor, the stop can beprecisely set, and since the motor speed control is linked to thephotographing mode selection, missetting of the stop aperture isprevented.

Since the stopping velocity is controlled independently from the filmfeed speed after the shutter operation, the preparation operation forthe next photographing after the current photographing is notunnecessarily slowed down.

While the single motor is used in the present embodiment to drive therespective mechanisms in the camera, the present invention is notlimited thereto but it is equally applicable to a camera which drivesthe mechanisms in the camera by a plurality of motors. For example,where the film is wound by a first motor and the stop and the mirror aredriven by a second motor, voltages to be applied to the first and secondmotors may be independently varied.

We claim:
 1. A drive device for a camera comprising:(a) an electricmotor; (b) stop drive means adapted to be driven by said electric motorto change a stop aperture of a lens; (c) means for measuring thebrightness of a subject to be photographed, and which generates anelectric signal when said stop aperture which is changed reaches apredetermined aperture adaptive to the brightness of said subject; (d)means for stopping said stop drive means in response to said electricsignal; (e) film wind-up means adapted to be driven by said electricmotor to wind up a film frame by frame; and (f) control means forcausing said electric motor to make a first rotation to drive said stopdrive means prior to exposure of the film and causing said electricmotor to make a second rotation to drive said film wind-up means afterthe exposure of the film, said control means including means for varyingthe rotating speed of said electric motor for said second rotation andmeans for adjusting the rotating speed of said electric motor to adetermined speed for said first rotation.
 2. A drive device according toclaim 1, wherein said electric motor rotates in one direction at thetime of said first rotation and rotates in the other direction at thetime of said second rotation.
 3. A drive device for a camera,comprising:(a) an electric motor; (b) reflecting mirror means which ismovable by said electric motor from its position intersecting a lightpath between a lens and an exposed film to its postion retracted fromthe light path; (c) film wind-up means adapted to be driven by saidelectric motor to wind up a film frame by frame; and (d) control meansfor causing said electric motor to make a first rotation to drive saidmirror means prior to exposure to the film and causing said electricmotor to make a second rotation to drive said film wind-up means afterthe exposure to the film, said control means including means for varyingthe rotating speed of said electric motor for said second rotation andmeans for adjusting the rotating speed of said electric motor to adetermined speed for said first rotation.
 4. A drive device accordingclaim 3, wherein said electric motor rotates in one direction at thetime of said first rotation and rotates in the other direction at thetime of said second direction.
 5. A photographic still camera,comprising:(a) electric motor means; (b) stop drive means adapted to bedriven by said electric motor means to change a stop aperture of a lens;(c) means for electrically latching said stop drive means when said stopaperture is changed to a predetermined value; (d) wind-up means adaptedto be driven by said electric motor means to wind up a film frame byframe; and (e) control means for controlling said electric motor means,said control means including means for adjusting the rotation speed ofsaid electric motor means to a first constant speed to drive said stopdrive means and adjusting the rotation speed to a second constant speedslower than the first constant speed to drive said wind-up means.
 6. Aphotographic still camera according to claim 5, further comprisingswitch means having a plurality of operation positions including firstand second operation positions and adapted to be switchable between saidoperation positions by an operator, and wherein said adjusting means isadapted to respond to said switch means and to adjust the rotation speedof said electric motor means for driving said wind-up means so that therotation speed of said electric motor means is controlled to said firstconstant speed when said switch means is at said first operationposition and controlled to said second constant speed when at saidsecond operation position.
 7. A photographic camera, comprising:(a)electric motor means; (b) means adapted to produce a speed signalresponsive to the rotating speed of said electric motor means; (c) stopaperture driving means shiftable in response to the rotation of saidelectric motor means so that a stop aperture of a lens may be variedfrom maximum aperture toward minimum aperture; (d) means which stops theshift of said stop aperture driving means when the stop aperture of thelens changes to a given diaphragm value; (e) the stop means includingmeans which produces a stop signal before said stop aperture which ischanging reaches said given diaphragm value and means which is actuatedin response to said stop signal and connects to said stop aperturedriving means; and (f) the stop signal producing means includingcompensation means which accelerates the time of generating said stopsignal responsive to said speed signal according to the increasedrotating speed of said electric motor means.
 8. A photographic cameraaccording to claim 7, wherein said stop signal generating means includesmeans which provide an electric output corresponding to the diaphragmvalue given by the stop aperture of the lens which is changing, byoperably associating with said stop aperture driving means.
 9. Aphotographic camera according to claim 8, wherein said stop signalgenerating means further includes means adapted to provide a referenceoutput representing said given diaphragm value and means adapted tocompare said electric output with said reference output and wherein saidcompensation means causes the electric level of said reference output tovary in response to said speed signal.
 10. A drive device for a camera,comprising:(a) an electric motor; (b) stop drive means adapted to bedriven by said electric motor to change a stop aperture of a lens; (c)means for measuring the brightness of a subject to be photographed, andwhich generates an electric signal when said stop aperture which ischanged reaches a predetermined aperture adaptive to the brightness ofsaid subject; (d) means for stopping said stop drive means in responseto said electric signal; (e) film wind-up means adapted to be driven bysaid electric motor to wind up a film frame by frame; (f) means forsupplying electric power to said electric motor, said electric powersupply means including means for switching an average output electricpower between a plurality of different values; (g) control means forcausing said electric motor to make a first rotation to drive said stopdrive means prior to exposure of the film and causing said electricmotor to make a second rotation to drive said film wind-up means afterthe exposure of the film; and (h) adjusting means operative to adjustthe electric power from said electric power supply means to apredetermined level and supply the same to said electric motor duringsaid first rotation of said electric motor.
 11. A photographic camera,comprising:(a) electric motor means; (b) a camera housing having a filmchamber for receiving a film supply spool and a film take-up spool, thecamera housing being provided with a lid member for closing the filmchamber; (c) advancing means adapted to be driven by said electric motormeans to feed a film from said supply spool to said take-up spool; (d)switch means adapted to be operated by an operator for starting therotation of said electric motor means; and (e) means for driving saidelectric motor means in response to said switch means, the driving meanscausing the electric motor means to rotate during a determined period oftime when said film chamber is closed by said lid member and causing theelectric motor means to rotate during a period of time shorter than saiddetermined period of time when said lid member is open.
 12. Aphotographic camera according to claim 11, wherein said driving meansincludes timer means which measures a predetermined time in response tothe operation of said switch means and means which stops the rotation ofsaid electric motor means in response to the termination of themeasurement by said timer means.
 13. A photographic camera according toclaim 12, wherein said timer means includes means which changes saidpredetermined time in association with the rotation speed of saidelectric motor means.
 14. A photographic camera according to claim 11,wherein said driving means includes timer means having a first timecounting mode for counting said determined period of time and a secondtime counting mode for counting said shorter period of time and meansfor selecting the mode in response to said lid member.
 15. Aphotographic still camera, comprising:(a) electric motor means; (b) stopdrive means adapted to be driven by said electric motor means to changea stop aperture of a lens; (c) means for electrically latching said stopdrive means when said stop aperture is changed to a predetermined value;(d) means adapted to be driven by said electric motor means foradvancing a film; and (e) control means for controlling said electricmotor means, said control means including means for adjusting therotation speed of said electric motor means to a first constant speed todrive said stop drive means and adjusting the rotation speed to a secondconstant speed slower than the first constant speed to drive saidadvancing means.
 16. A photographic camera, comprising:(a) electricmotor means; (b) a camera housing having a film chamber for receiving afilm supply spool and a film take-up spool, the camera housing beingprovided with a lid member for closing the film chamber; (c) advancingmeans adapted to be driven by said electric motor means to feed a filmfrom said supply spool to said take-up spool; (d) an operation memberadapted to be operated by an operator from an initial position to anoperated position; and (e) means for controlling the rotation of saidelectric motor means in response to said operation member when said lidmember is open, the control means including a power supplying circuitadpated to be enabled when said operation member is operated to saidoperated position for supplying an electric power to said electric motormeans and a braking circuit adapted to be enabled when said operationmember is returned to said initial position for stopping the rotation ofsaid electric motor means.
 17. A photographic camera according to claim16, further comprising means for limiting the continuous rotation ofsaid electric motor means within a predetermined period of time.
 18. Aphotographic camera according to claim 17, wherein said limiting meansincludes timer means which measures said predetermined period of time inresponse to the operation of said operation member and means whichenables said braking circuit in response to the termination of themeasurement by said timer means.
 19. A photographic camera according toclaim 18, wherein said timer means includes means which changes saidpredetermined period of time in association with the rotation speed ofsaid electric motor means.